CN203166533U - Stepless reactive power compensation device with individual phase control - Google Patents
Stepless reactive power compensation device with individual phase control Download PDFInfo
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- CN203166533U CN203166533U CN2013201554778U CN201320155477U CN203166533U CN 203166533 U CN203166533 U CN 203166533U CN 2013201554778 U CN2013201554778 U CN 2013201554778U CN 201320155477 U CN201320155477 U CN 201320155477U CN 203166533 U CN203166533 U CN 203166533U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The utility model discloses a stepless reactive power compensation device with individual phase control. The device comprises three compensation units in star-shaped connection. Each compensation unit is corresponding to a phase line of a three-phase power supply respectively. In the compensation unit, an output end of a power factor controller is connected with an input end of a DSP, an output end of the DSP is connected with an input end of a CPLD, output signals of a voltage transformer and a current transformer are shaped by a shaping circuit and are connected with the input end of the CPLD, four control output ends of the CPLD are respectively in series connection with four driving chips and are respectively connected with base electrodes of the four transistors, and the control of the compensation capacitance is realized through the four transistors, two diodes, a filter capacitor, an inductor and a transformer together. According to the compensation device, a good compensation effect can be obtained, the cost is far lower than that of an SVG and an SVC, the maintenance is simple, a rapid stepless compensation device can be formed by the device and a traditional compensation cabinet, the compensation precision is raised, and a better compensation effect is obtained.
Description
Technical field
The utility model relates to a kind of reactive power compensator, but relates in particular to a kind of stepless reactive power compensator of phase-splitting control.
Background technology
Traditional reactive power compensator mainly is by mechanical switch or electronic switch classification switched capacitor, for fear of impact, before capacitor, be in series with reactor, for phase splitting compensation, also have controller to export the phase splitting compensation signal according to line conditions, but switching is all for there being a grade switching.Impact because the switching characteristic of mechanical switch and capacitor can not bear frequently, so the response speed of mechanical switch is very slow, is generally several minutes response time.For quick response, employing electronic switch (being essentially thyristor) is also arranged at present on the market as quick fling-cut switch, the employing zero passage drops into, utilize the automatic characteristic of cutting off of current over-zero of thyristor to finish nothing impact switching, but because thyristor can only use as switch, therefore also a grade switched capacitor can only be arranged, because the turn-off characteristic of thyristor, therefore the minimum switching time of thyristor can not be less than one-period, along with the change of user's demand and the requirement of equipment, there is the place that much needs the fast stepless reactive power compensation in 20ms just, at present in order to reach the purpose of stepless compensation, the technological means below main the existence:
(1) SVC: fixed capacitor, reactor is held in parallel connections etc., regulate the electric current that flows through reactor continuously by thyristor, thereby continuously change reactance value, both additions reach the idle purpose of continuous adjusting, but there is a lot of disadvantages in SVC, as controls complexity, protection difficulty, can produce very big harmonic wave under the bigger situation of modulation rate, and special harmonic filtering circuit must be set; Cost is too high, owing to have the reactor continuous firing, so energy consumption is big.SVC generally is used in the powerful high pressure power utilization environment, as users such as smelting industries.
(2) SVG:SVG is as the technological achievement of up-to-date power electronics, send or absorb idle by inversion, have good dynamic response speed and very good compensation effect, can compensate perception and capacitive reactive power simultaneously, a lot of shortcomings of conventional compensation have been overcome, such as not forming resonance, can not transship with system, under any situation, can both provide idle support, but also has a lot of shortcomings that temporarily can't overcome at present, as capacity can not do very big, expensive, difficult in maintenance, domestic consumer can't carry out even the simplest maintenance etc.
Therefore still adopt the grading capacitor compensation way to come compensating reactive power at the consideration majority that much needs the idle place user of fast stepless adjusting based on cost and maintainability.So just cause reactive power fluctuation bigger, compensation effect is relatively poor, thereby also causes the fluctuation of system voltage, influences the work of precision equipment, because compensation effect is bad, causes actual power factor to be lower than required value, is added extra fine.
The utility model content
But the purpose of this utility model just is to provide in order to address the above problem a kind of stepless reactive power compensator of phase-splitting control.
The utility model is achieved through the following technical solutions above-mentioned purpose:
But the stepless reactive power compensator of phase-splitting control described in the utility model comprises three compensating units that are Y-connection, each described compensating unit is corresponding with the phase line of three phase mains respectively, described compensating unit comprises power factor controller, voltage transformer, current transformer, two shaping circuits, DSP, CPLD, four drive chip, four transistors, four diodes, filter capacitor, building-out capacitor, inductance and transformer, the analog signal output of described power factor controller is connected with the signal input part of described DSP, the pwm signal output of described DSP is connected with the pwm signal input of described CPLD, the signal output part of described voltage transformer is connected with the voltage signal input of described CPLD with a described shaping circuit series connection back, the signal output part of described current transformer is connected with the current signal input of described CPLD with a described shaping circuit series connection back, the drive feedback output of described CPLD is connected with the drive feedback input of described DSP, four control output ends of described CPLD are connected with the input of four described driving chips respectively, and the fault-signal output of four described driving chips is connected with four fault-signal inputs of described CPLD respectively; The output of four described driving chips is connected with four described transistorized base stages respectively, the collector electrode of the first transistor is connected with the negative pole of phase line with first diode respectively, the emitter of described the first transistor respectively with the collector electrode of transistor seconds, the positive pole of described first diode is connected with the positive pole of second diode, the emitter of described transistor seconds is the negative pole of described second diode respectively, first end of inductance, the negative pole of the 3rd diode is connected with the collector electrode of the 3rd triode, the emitter of described the 3rd triode respectively with the positive pole of described the 3rd diode, the positive pole of the 4th diode is connected with the collector electrode of the 4th triode, the emitter of described the 4th triode respectively with the negative pole of described the 4th diode, first end of described filter capacitor, first end of the primary coil of described transformer is connected with zero line, second end of described inductance is connected with second end of the primary coil of second end of described filter capacitor and described transformer respectively, first end of the secondary coil of described transformer is connected with described phase line, and second end of the secondary coil of described transformer is connected and is connected with described zero line behind the described building-out capacitor.
Above-mentioned stepless compensation arrangement is to have utilized square principles of construction that is directly proportional of the idle and terminal voltage that compensation condenser sends to form, utilize series connection variable flux compensation voltage-regulating technique, regulate the magnetic flux of the secondary side of the transformer of connecting with filtering capacitor continuously by the AC chopping mode, thereby the primary side voltage of continuously-variable transformer, also just regulate the terminal voltage of compensation condenser continuously, can continuously change idle that compensation condenser sends.If the adjustable extent of transformer is 25% ~ 100%.The adjustable scope of reactive power compensation then is 6.25% ~ 100% adjustable continuously so, and this precision enough satisfies most idle changes of load.Whole device connects into star by three identical compensating units, inserts in the three-phase four-wire system, and the independent compensation three-phase is uneven idle rapidly, thereby reaches the approximate stepless idle effect of adjusting.
Particularly, described triode is insulated gate bipolar transistor.
Described driving chip is EXB840 high-speed driving chip.
The beneficial effects of the utility model are:
Compensation arrangement described in the utility model can be obtained very good compensation effect, on cost far below traditional SVG and SVC, and safeguard comparatively simple, can constitute the fast stepless compensation arrangement with traditional compensating cabinet, improve compensation precision, obtain better compensation effect, be particularly useful for the electricity consumption place of the idle quick change of three-phase imbalance, as places such as automobile factory, Metal Processing Factory, welding shops.
Description of drawings
But Fig. 1 is the electrical block diagram of the stepless reactive power compensator of phase-splitting control described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, but the stepless reactive power compensator of phase-splitting control described in the utility model comprises three compensating units that are Y-connection, each compensating unit is corresponding with the phase line of three phase mains respectively, compensating unit comprises power factor controller, voltage transformer, current transformer, two shaping circuits, DSP, CPLD, four EXB840 high-speed driving chips, four insulated gate bipolar transistors (are the first transistor V1, transistor seconds V2, the 3rd transistor V3 and the 4th transistor V4), four diodes (i.e. first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4), filter capacitor C1, building-out capacitor C2, inductance L 1 and transformer TA, the analog signal output of power factor controller is connected with the signal input part of DSP, the pwm signal output of DSP is connected with the pwm signal input of CPLD, the signal output part of voltage transformer is connected with the voltage signal input of CPLD with a shaping circuit series connection back, the signal output part of current transformer is connected with the current signal input of CPLD with a shaping circuit series connection back, the drive feedback output of CPLD is connected with the drive feedback input of DSP, four control output ends of CPLD are connected with the input of four EXB840 high-speed driving chips respectively, and the fault-signal output of four EXB840 high-speed driving chips is connected with four fault-signal inputs of CPLD respectively; The output of four EXB840 high-speed driving chips is connected with four transistorized base stages respectively, the collector electrode of the first transistor V1 is connected with the negative pole of the first diode D1 with phase line A respectively, the emitter of the first transistor V1 respectively with the collector electrode of transistor seconds V2, the positive pole of the first diode D1 is connected with the positive pole of the second diode D2, the emitter of transistor seconds V2 is the negative pole of the second diode D2 respectively, first end of inductance L 1, the negative pole of the 3rd diode D3 is connected with the collector electrode of the 3rd triode V3, the emitter of the 3rd triode V3 respectively with the positive pole of the 3rd diode D3, the positive pole of the 4th diode D4 is connected with the collector electrode of the 4th triode V4, the emitter of the 4th triode V4 respectively with the negative pole of the 4th diode D4, first end of filter capacitor C1, first end of the primary coil of transformer TA is connected with zero line N, second end of inductance L 1 is connected with second end of the primary coil of second end of filter capacitor C1 and transformer TA respectively, first end of the secondary coil of transformer TA is connected with phase line A, is connected with zero line N behind the second end series compensation capacitance C2 of the secondary coil of transformer TA.Wherein, voltage transformer, current transformer, two shaping circuits, DSP, CPLD and four EXB840 high-speed driving chips constitute control device jointly.
As shown in Figure 1, the course of work of this reactive power compensator is as follows:
DSP receives the analog signal from power factor controller, DSP is digital signal by the A/D circuit with analog signal conversion earlier, produce corresponding PWM waveform again, give CPLD, the voltage transformer summation current transformer detects electric current and voltage simultaneously, and the square wave by shaping circuit output voltage and electric current, deliver to CPLD, computing by CPLD, the incomplementarity that draws four road insulated gate bipolar transistors drives signal, DSP carries out soft start function simultaneously, reduces the impact of insulated gate bipolar transistor.The fault-signal of EXB840 high-speed driving chip is delivered to CPLD, in fault, blocks to drive signal, thus the protection insulated gate bipolar transistor.
Above-mentioned stepless compensation arrangement is to have utilized square principles of construction that is directly proportional of the idle and terminal voltage that compensation condenser C2 sends to form, utilize series connection variable flux compensation voltage-regulating technique, regulate the magnetic flux of the secondary coil of the transformer TA that connects with filtering capacitor C1 continuously by the AC chopping mode, thereby the voltage of the primary coil of continuously-variable transformer TA, also just regulate the terminal voltage of compensation condenser C2 continuously, can continuously change idle that compensation condenser C2 sends.If the adjustable extent of transformer TA is 25% ~ 100%.The adjustable scope of reactive power compensation then is 6.25% ~ 100% adjustable continuously so, and this precision enough satisfies most idle changes of load.Whole device connects into star by three identical compensating units, inserts in the three-phase four-wire system, and the independent compensation three-phase is uneven idle rapidly, thereby reaches the approximate stepless idle effect of adjusting.
Claims (3)
1. but the stepless reactive power compensator of phase-splitting control, it is characterized in that: comprise three compensating units that are Y-connection, each described compensating unit is corresponding with the phase line of three phase mains respectively, described compensating unit comprises power factor controller, voltage transformer, current transformer, two shaping circuits, DSP, CPLD, four drive chip, four transistors, four diodes, filter capacitor, building-out capacitor, inductance and transformer, the analog signal output of described power factor controller is connected with the signal input part of described DSP, the pwm signal output of described DSP is connected with the pwm signal input of described CPLD, the signal output part of described voltage transformer is connected with the voltage signal input of described CPLD with a described shaping circuit series connection back, the signal output part of described current transformer is connected with the current signal input of described CPLD with a described shaping circuit series connection back, the drive feedback output of described CPLD is connected with the drive feedback input of described DSP, four control output ends of described CPLD are connected with the input of four described driving chips respectively, and the fault-signal output of four described driving chips is connected with four fault-signal inputs of described CPLD respectively; The output of four described driving chips is connected with four described transistorized base stages respectively, the collector electrode of the first transistor is connected with the negative pole of phase line with first diode respectively, the emitter of described the first transistor respectively with the collector electrode of transistor seconds, the positive pole of described first diode is connected with the positive pole of second diode, the emitter of described transistor seconds is the negative pole of described second diode respectively, first end of inductance, the negative pole of the 3rd diode is connected with the collector electrode of the 3rd triode, the emitter of described the 3rd triode respectively with the positive pole of described the 3rd diode, the positive pole of the 4th diode is connected with the collector electrode of the 4th triode, the emitter of described the 4th triode respectively with the negative pole of described the 4th diode, first end of described filter capacitor, first end of the primary coil of described transformer is connected with zero line, second end of described inductance is connected with second end of the primary coil of second end of described filter capacitor and described transformer respectively, first end of the secondary coil of described transformer is connected with described phase line, and second end of the secondary coil of described transformer is connected and is connected with described zero line behind the described building-out capacitor.
2. but the stepless reactive power compensator of phase-splitting according to claim 1 control, it is characterized in that: described triode is insulated gate bipolar transistor.
3. but the stepless reactive power compensator of phase-splitting according to claim 1 control, it is characterized in that: described driving chip is EXB840 high-speed driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201554778U CN203166533U (en) | 2013-04-01 | 2013-04-01 | Stepless reactive power compensation device with individual phase control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201554778U CN203166533U (en) | 2013-04-01 | 2013-04-01 | Stepless reactive power compensation device with individual phase control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546043A (en) * | 2013-10-30 | 2014-01-29 | 科大智能科技股份有限公司 | IGBT current transformer and static var generator formed by same |
| CN105932692A (en) * | 2016-05-30 | 2016-09-07 | 鹿寨县众盛商贸有限公司 | Novel reactive power compensation device for power distribution network |
| CN108092279A (en) * | 2017-12-22 | 2018-05-29 | 国网山东省电力公司滨州供电公司 | A kind of device for comprehensively compensating reactive power harmonics of electric power system |
| CN108306308A (en) * | 2018-02-05 | 2018-07-20 | 杭州英菲菱集成电路有限公司 | A kind of stepless adjustable apparatus for adjusting capacity controlled using IGBT |
-
2013
- 2013-04-01 CN CN2013201554778U patent/CN203166533U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546043A (en) * | 2013-10-30 | 2014-01-29 | 科大智能科技股份有限公司 | IGBT current transformer and static var generator formed by same |
| CN105932692A (en) * | 2016-05-30 | 2016-09-07 | 鹿寨县众盛商贸有限公司 | Novel reactive power compensation device for power distribution network |
| CN108092279A (en) * | 2017-12-22 | 2018-05-29 | 国网山东省电力公司滨州供电公司 | A kind of device for comprehensively compensating reactive power harmonics of electric power system |
| CN108306308A (en) * | 2018-02-05 | 2018-07-20 | 杭州英菲菱集成电路有限公司 | A kind of stepless adjustable apparatus for adjusting capacity controlled using IGBT |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20150401 |
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| EXPY | Termination of patent right or utility model |